EDUC 2591 Lecture Notes - Lecture 10: Associative Property, Commutative Property, Distributive Property
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> subitizing: ability to recognize certain numbers by looking at it. 9, 10, 11, 12, 13, 14, 15 : counting on. Commutative property: a property of addition and multiplication that allows the numbers to be added or multiplied in any order, without affecting the sum or product of the operation. In general, a + b = b + a and a x b = b x a. This property does not generally hold for subtraction or division: grade 1. Associative property: a property of addition and multiplication that allows the numbers being added or multiplied to be regrouped without changing the outcome of the operations. = 7 + (9 + 1) and (7 x 4) x 5 = 7 x (4 x 5) in general, (a + b) + c = a + (b + c) and (a x b) x c. This property does not generally hold for subtraction or division.